I finally found the pack weight notes that I took at Philmont base camp on the morning we started on our trek in 2010.
I’ve estimated base weights by subtracting thirteen pounds. We were carrying four days of Philfood (seven pounds), and most of us were carrying three liters of water (six pounds).
The median pack weight was 42 pounds (29 pounds estimated base weight). The average was 40.1 pounds (27.1 pounds estimated base weight). Total pack weight for the crew was 401 pounds.